1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
# Copyright 2019-2021 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
# https://developers.redhat.com/blog/2019/05/17/an-introduction-to-linux-virtual-interfaces-tunnels/#erspan
# http://vger.kernel.org/lpc_net2018_talks/erspan-linux-presentation.pdf
from copy import deepcopy
from netaddr import EUI
from netaddr import mac_unix_expanded
from random import getrandbits
from vyos.util import dict_search
from vyos.ifconfig.interface import Interface
from vyos.validate import assert_list
@Interface.register
class _ERSpan(Interface):
"""
_ERSpan: private base class for ERSPAN tunnels
"""
iftype = 'erspan'
definition = {
**Interface.definition,
**{
'section': 'erspan',
'prefixes': ['ersp',],
},
}
def __init__(self,ifname,**config):
self.config = deepcopy(config) if config else {}
super().__init__(ifname, **self.config)
def change_options(self):
pass
def update(self, config):
""" General helper function which works on a dictionary retrived by
get_config_dict(). It's main intention is to consolidate the scattered
interface setup code and provide a single point of entry when workin
on any interface. """
# call base class first
super().update(config)
# Enable/Disable of an interface must always be done at the end of the
# derived class to make use of the ref-counting set_admin_state()
# function. We will only enable the interface if 'up' was called as
# often as 'down'. This is required by some interface implementations
# as certain parameters can only be changed when the interface is
# in admin-down state. This ensures the link does not flap during
# reconfiguration.
state = 'down' if 'disable' in config else 'up'
self.set_admin_state(state)
def _create(self):
pass
class ERSpanIf(_ERSpan):
"""
ERSpanIf: private base class for ERSPAN Over GRE and IPv4 tunnels
"""
def _create(self):
ifname = self.config['ifname']
source_address = self.config['source_address']
remote = self.config['remote']
key = self.config['parameters']['ip']['key']
version = self.config['parameters']['version']
command = f'ip link add dev {ifname} type erspan local {source_address} remote {remote} seq key {key} erspan_ver {version}'
if int(version) == 1:
idx=dict_search('parameters.erspan.idx',self.config)
if idx:
command += f' erspan {idx}'
elif int(version) == 2:
direction=dict_search('parameters.erspan.direction',self.config)
if direction:
command += f' erspan_dir {direction}'
hwid=dict_search('parameters.erspan.hwid',self.config)
if hwid:
command += f' erspan_hwid {hwid}'
ttl = dict_search('parameters.ip.ttl',self.config)
if ttl:
command += f' ttl {ttl}'
tos = dict_search('parameters.ip.tos',self.config)
if tos:
command += f' tos {tos}'
self._cmd(command)
def change_options(self):
ifname = self.config['ifname']
source_address = self.config['source_address']
remote = self.config['remote']
key = self.config['parameters']['ip']['key']
version = self.config['parameters']['version']
command = f'ip link set dev {ifname} type erspan local {source_address} remote {remote} seq key {key} erspan_ver {version}'
if int(version) == 1:
idx=dict_search('parameters.erspan.idx',self.config)
if idx:
command += f' erspan {idx}'
elif int(version) == 2:
direction=dict_search('parameters.erspan.direction',self.config)
if direction:
command += f' erspan_dir {direction}'
hwid=dict_search('parameters.erspan.hwid',self.config)
if hwid:
command += f' erspan_hwid {hwid}'
ttl = dict_search('parameters.ip.ttl',self.config)
if ttl:
command += f' ttl {ttl}'
tos = dict_search('parameters.ip.tos',self.config)
if tos:
command += f' tos {tos}'
self._cmd(command)
class ER6SpanIf(_ERSpan):
"""
ER6SpanIf: private base class for ERSPAN Over GRE and IPv6 tunnels
"""
def _create(self):
ifname = self.config['ifname']
source_address = self.config['source_address']
remote = self.config['remote']
key = self.config['parameters']['ip']['key']
version = self.config['parameters']['version']
command = f'ip link add dev {ifname} type ip6erspan local {source_address} remote {remote} seq key {key} erspan_ver {version}'
if int(version) == 1:
idx=dict_search('parameters.erspan.idx',self.config)
if idx:
command += f' erspan {idx}'
elif int(version) == 2:
direction=dict_search('parameters.erspan.direction',self.config)
if direction:
command += f' erspan_dir {direction}'
hwid=dict_search('parameters.erspan.hwid',self.config)
if hwid:
command += f' erspan_hwid {hwid}'
ttl = dict_search('parameters.ip.ttl',self.config)
if ttl:
command += f' ttl {ttl}'
tos = dict_search('parameters.ip.tos',self.config)
if tos:
command += f' tos {tos}'
self._cmd(command)
def change_options(self):
ifname = self.config['ifname']
source_address = self.config['source_address']
remote = self.config['remote']
key = self.config['parameters']['ip']['key']
version = self.config['parameters']['version']
command = f'ip link set dev {ifname} type ip6erspan local {source_address} remote {remote} seq key {key} erspan_ver {version}'
if int(version) == 1:
idx=dict_search('parameters.erspan.idx',self.config)
if idx:
command += f' erspan {idx}'
elif int(version) == 2:
direction=dict_search('parameters.erspan.direction',self.config)
if direction:
command += f' erspan_dir {direction}'
hwid=dict_search('parameters.erspan.hwid',self.config)
if hwid:
command += f' erspan_hwid {hwid}'
self._cmd(command)
|
